|ISBN (pdf):||978-952-11-4134-8|| |
|Julkaisusarja ja numero:||Reports of the Finnish Environment Institute 4/2013|| |
|Kustantaja:||Finnish Environment Institute|| |
|Saatavuus (pdf):||http://hdl.handle.net/10138/40180|| |
|Tekijät:||Mirja Leivuori; Minna Rantanen; Katarina Björklöf; Keijo Tervonen; Sari Lanteri; Markku Ilmakunnas
Proftest SYKE arranged proficiency test for measurement the gross and the net calorific value, the content of ash, carbon, nitrogen, hydrogen, moisture, sulphur and volatile matter in fuels in September - October 2012. One peat sample, one wood pellet and one coal sample were delivered to the laboratories for the analysis of each measurement. In total, 38 laboratories participated in the proficiency test. Additionally, the participants were asked to estimate/calculate the emission factor for the samples. The robust means of the reported results by the participants were used as the assigned values for measurements. The evaluation of performance was based on the z score which was calculated using the standard deviation for proficiency assessment at 95 % confidence level. The total standard deviation for performance assessment was mainly set on the basis of the reproducibility requirements presented the standard methods. The evaluation of performance was not done for the measurement of moisture. In total, 93 % of the participating laboratories reported the satisfactory results when the deviations of 1-30 % from the assigned values were accepted. About 76 % of the participants used accredited methods and 93 % of their results were satisfactory. In measurement of the gross calorific value from the peat sample 86 %, from the wood pellet sample 88 % and from the coal sample 96 % of the results were satisfactory. In measurement of the net calorific value from the peat sample 82 %, from the wood pellet 80 % and from the coal sample 100 % of the results were satisfactory.